It would be wise to avoid using this ......it will be residual in the fruits/vegetables you consume

Here’s what happens: undigested proteins from gluten (also known as gliadin) get noticed by the immune system in our gut, triggering an inflammatory response that can spread throughout the body.
What are the Negative Health Consequences of Gluten?

Gluten then causes leaky gut, an immune system/digestive issue in which the cells lining the intestines, and the space between them, is damaged, allowing food to leak through (gluten and as well as other food) and to trigger inflammatory responses while decreasing absorption of nutrients.

Then, there’s celiac disease, which is an autoimmune disease in which further damage to the intestines due to immune responses to gluten can cause severe and life threatening health issues.

It is estimated that 1 in 133 people have developed celiac disease already – that’s over 2 million people in the U.S – and most of them have no idea.

Even if you don’t have celiac disease, it is thought that at least 1 in 4 people develop what is now known as non-celiac gluten sensitivity (NCGS).

NCGS is associated with a number of health issues varying from fatigue and bloating to migraines and PMS. The effective treatment for both celiac disease and NCGS is the avoidance of gluten.
How Does Gluten Cause Stress on the Body?

The dangers of gluten don’t stop there. Once the immune system in the intestines starts reacting to gluten, it is exponentially more likely that the immune system will start reacting to other foods – most often dairy proteins (casein and whey), eggs, potato, soy, and other grains (rice, millet, and corn).

Related: Boost Your Immune System With These 4 Foods

At this point, a person is often hit by digestive symptoms, no matter what they eat, and potentially also experiences fatigue, sleep issues, mood changes, skin rashes, frequent infections, thyroid issues, and in some cases, autoimmunity. - ref: http://inspiyr.com/dangers-of-eating-gluten/

I am not a MD, this possibly would be an avoidance you would want to practice if you have Celiac. I use it only on my lawn so do not think that it would present a problem. I do believe that corn gluten is used in chicken feed. Thanks for the info!